diff --git a/rails/allow-list-params-anywhere-with-strong-params.md b/rails/allow-list-params-anywhere-with-strong-params.md
index 96035e4..e1d71aa 100644
--- a/rails/allow-list-params-anywhere-with-strong-params.md
+++ b/rails/allow-list-params-anywhere-with-strong-params.md
@@ -15,7 +15,7 @@ class BookTitleUpdater
   def self.run(data)
     params = ActionController::Parameters.new(data).permit(*ALLOW_LIST)
 
-    Book.find(params[:id]).update!(params)
+    Book.find(data[:id]).update!(params)
   end
 end
 ```